Immobilization of mercury and arsenic in a mine tailing from a typical Carlin-type gold mining site in southwestern part of China

Wang, Jianxu; Sun, Xuecheng; Xing, Ying; Xia, Jicheng; Feng, Xinbin

doi:10.1016/j.jclepro.2019.118171

Cited by 26 publications

(8 citation statements)

References 55 publications

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“…Mercury-contaminated paddy fields in many developing countries (e.g., China, Indonesia, Brazil, Philippines, Cambodia, India, Thailand, and Tanzania) have attracted global concern because of recorded health issues in populations which consume contaminated rice grain. A key constraint on progressing mercury remediation, and mitigating exposure pathways and risk is the lack of reliable, affordable technology. , In the current work we have found for the first time that amendment of soil with nanoactivated carbon (NAC) can reduce the Hg concentration in soil pore water and its uptake by Oryza sativa L.…”

Section: Resultsmentioning

confidence: 97%

“…A key constraint on progressing mercury remediation, and mitigating exposure pathways and risk is the lack of reliable, affordable technology. 59,60 In the current work we have found for the first time that amendment of soil with nanoactivated carbon (NAC) can reduce the Hg concentration in soil pore water and its uptake by Oryza sativa L.…”

Section: ■ Materials and Methodsmentioning

confidence: 95%

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Nanoactivated Carbon Reduces Mercury Mobility and Uptake by Oryza sativa L: Mechanistic Investigation Using Spectroscopic and Microscopic Techniques

Wang

Shaheen

Anderson

et al. 2020

Environ. Sci. Technol.

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Mercury (Hg) contamination of paddy field poses a health risk to rice consumers, and its remediation is a subject of global scientific attention. In recent years focus has been given to in situ techniques which reduce the risk of Hg entering the food chain. Here, we investigate the use of nanoactivated carbon (NAC) as a soil amendment to minimize Hg uptake by rice plants. Application of 1–3% NAC to soil (by weight) reduced Hg concentration in the pore water (by 61–76%) and its bioaccumulation in the tissues of rice plants (by 15–63%), relative to the corresponding control. Specifically, NAC reduced the Hg concentration of polished rice by 47–63% compared to the control, to a level that was 29–49% lower than the food safety value (20 ng g–1) defined by the Chinese government. The NAC induced a change in Hg binding from organic matter to nano-HgS in the soil as a function of soil amendment. This Hg speciation transformation might be coupled to the reduction of sulfoxide to reduced sulfur species (S0) by NAC. The NAC amendment may be a practical and effective solution to mitigate the risk of Hg transferring from contaminated soil to rice grains at locations around the world.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Materials and Methodsmentioning

confidence: 95%

Nanoactivated Carbon Reduces Mercury Mobility and Uptake by Oryza sativa L: Mechanistic Investigation Using Spectroscopic and Microscopic Techniques

Wang

Shaheen

Anderson

et al. 2020

Environ. Sci. Technol.

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“…In order to solve the environmental problems caused by tailings accumulation, people have been seeking solutions and conducting research on the comprehensive utilization of tailings. For example, residual gold and associated metal elements such as Ag, Cu, Pb, Zn, and W can be recovered from tailings [1][2][3][4] , and non-metallic minerals such as quartz, feldspar, and sericite can be extracted from tailings [5][6] . In recent years, the gold grade of mines has gradually decreased and the value of tailings has become lower.…”

Section: Introductionmentioning

confidence: 99%

Reuse gold tailings as filling materials for depleted mines

Hu,

Guo,

et al. 2023

Preprint

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The accumulation of gold mine tailings poses a significant environmental challenge. The feasibility of reuse this waste as underground filling materials was investigated in this work. The filling materials were prepared by mixing the tailings, Portland cement and water using a one-step method. The fluidity, bleeding rate, setting time, mechanical behavior, water quality analysis and toxicity characteristic of leaching solution of the filling materials with various tailings/cement ratios and slurry concentrations were characterized and assessed. The results show secondary hydration reaction occurred between the tailings and the cement. The rheological properties, setting/hardening properties and bleeding rate became less favorable with the increase of the tailings/cement ratio and slurry concentration. The water quality index of the leaching solution was lower than the permissible limit values. The uniaxial compressive strength of the filling materials prepared with a tailings/cement ratio of 4:1 and a slurry concentration of 68% was 0.99 MPa, which met the filling purposes. The values of heavy metal leaching (copper, zinc, cadmium, lead, total chromium, hexavalent chromium, beryllium, barium, argentum, selenium, nickel, hydrargyrum, arsenic, cyanide and fluorion) were much lower than the standard limits. This indicates that gold mine tailings could be utilized as the filling materials to reduce waste accumulation without causing any hazards to environment or human beings.

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“…1.1 Mine tailings and environmental significance MT in a specific affected area is characterized by the presence of multiple heavy metals associated with the ore, components used in the processing of minerals, low water retention capacity associated with unstable pH, low levels of micro/macronutrients and organic material (Liu et al, 2008;Ye et al, 2017b;Thouin et al, 2019;Wang et al, 2019a;Khorasanipour and Rashidi, 2020). Metals such as lead (Pb), iron (Fe), cadmium (Cd), mercury (Hg), nickel (Ni), zinc (Zn), arsenic (As), and chromium (Cr) are present in MT in different cationic compositions.…”

Section: Introductionmentioning

confidence: 99%